65 barracuda no bottom end need opinions

That whole engine combo is screwed up and mis-matched like a blind person shopping in a clown out fit store.

Rethink everything and what you want out of it. Like starting from scratch.
The 273 heads will help alot as well as another cam. Being it is set up as a roller, I would look at OE grinds. Like raiding a Magnum engine cam or there specs.

Or sell the roller stuff for moneys to roll over back into a nice Hyd. set up.